Distance measure of point to segment is one of the determinants which affect the efficiency of DP (Douglas-Peucker)
polyline simplification algorithm. Zone-divided distance measure instead of only perpendicular distance is proposed by
Dan Sunday  to improve the deficiency of the original DP algorithm. A new efficiency zone-divided distance measure
method is proposed in this paper. Firstly, a rotating coordinate is established based on the two endpoints of curve.
Secondly, the new coordinate value in the rotating coordinate is computed for each point. Finally, the new coordinate
values are used to divide points into three zones and to calculate distance, Manhattan distance is adopted in zone I and
III, perpendicular distance in zone II. Compared with Dan Sunday’s method, the proposed method can take full
advantage of the computation result of previous point. The calculation amount basically keeps for points in zone I and
III, and the calculation amount reduces significantly for points in zone II which own highest proportion. Experimental
results show that the proposed distance measure method can improve the efficiency of original DP algorithm.
This paper introduces a coaxial visible and infrared dual-band imager, which utilizes the visible and infrared detection technology, uptakes the scenery radiation of different wavelengths or optical energy reflected, adopts transmission and secondary reflection theory to design the coaxial optical path, and realizes the dual-band imaging of same scene. The imager can acquire the registered visible and infrared images, and effectively solves the problem of registration for visible and infrared images in different-source image fusion.
We report on the development of a multispectral multiphoton fluorescence lifetime imaging microscopy (MM-FLIM) system that is the combination a streak camera, a prism spectrophotometer, a femtosecond Ti: Sapphire laser and a fluorescence microscope. This system is versatile with multispectral capability, high temporal (10ps) and spatial (0.36μm) resolution and can be used to make 3-dimensional (3D) (x-y-z) multiphoton fluorescence intensity, spectrally resolved intensity and lifetime measurements with a single detector. The system was calibrated with a F-P etalon and a standard fluorescent dye and the lifetime value obtained was in good agreement with the value reported in the literature. Preliminary results suggest that this MM-FLIM system has integrated high temporal, spatial, and spectral resolution fluorescence detection in one microscopy system. Potential applications of this system include multiwell imaging, tissue discrimination, intracellular physiology and fluorescence resonance energy transfer imaging.